My father and I have our own company where we design and build lasers for various applications, depending on what the customer asks.

You can buy a green laser level for under $100.

I really do enjoy toying with real estate.

I did look up Airbnb in East Oakland, and surprisingly there are some properties that are doing very well, even in the hood, so I was toying with the idea. 

I have been recently talking about buying some land near our subdivision home to put a metal barn on to house my toys, and she had a great idea - buy the land, maybe 5 acres, put a mobile home or two on it, rent them out, and basically let it pay the note on the land, and maybe even some of the barn.What is the viability of this?

We are really wanting to purchase a "toy" like a boat to enjoy with the family and let the cash flow from the two properties pay for it. 

Along with make sure the battery in the smoke alarm hasn't been removed for a kids toy (I use smoke alarms where the battery is enclosed and cannot be removed).Some tenants complain about these checks, citing they are "invasive" and disturb their peaceful living situation. 

On 7/1 I entered the apt to find nothing but toys, leftover food, and random clothing strewn about.

That management company could buy toys like trucks and tools and take those deductions.

We went in with a laser tape and measured walls, cabinets and floors.